consolidating rpcs

rpc1()
rpc2()

problem: requires two tcp connections, when we could theoretically use just one

rpc("rpc1", "rpc2")

problem: makes rpcs look like second-class citizens

rpc1() // ...push into rpc list
rpc2() // ...push into rpc list
finalize_rpcs()

problem: need to remember to call finalize_rpcs()

rpc1() // ...setTimeout(finalize_rpcs, 0)
rpc2() // ...kills previous timeout, setTimeout(finalize_rpcs, 0)

good.